Starting of DC Motors

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Questions and Answers

What is the purpose of armature voltage control during the starting of a DC motor?

  • To limit the motor current to a safe value (correct)
  • To decrease the back emf during starting
  • To increase the motor current for faster starting
  • To prevent sparking at the commutator

How does adding a variable resistance in series with the armature circuit affect the motor's operation?

  • It limits the armature current at a safe value
  • It has no effect on the motor's operation
  • It decreases the no-load speed
  • It increases the speed drop during loading (correct)

What happens if a DC motor is started with full supply voltage across its terminals without any current limiting method?

  • The motor will not start at all
  • A very high current will flow, potentially damaging the motor (correct)
  • The motor will start smoothly without any issues
  • The back emf will increase, reducing the starting current

What is the effect of decreasing the variable resistance in series with the armature circuit as the motor accelerates?

<p>It decreases the armature current (D)</p> Signup and view all the answers

Which method is normally used to control the speed of a DC motor during operation?

<p>$V = I_a(R_a + R_s) + K_eΦω_m$ (C)</p> Signup and view all the answers

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